Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 24, Issue 20, Pages 2993-3002Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201303492
Keywords
ferroics; magnetic materials; ceramics; multiferroics
Categories
Funding
- European Union Seventh Framework Programme - ESTEEM2 (Integrated Infrastructure Initiative-I3) [312483]
- Natural Environment Research Council [NE/B505738/1, NE/017081/1]
- Engineering and Physical Sciences Research Council [EP/I036079/1]
- EPSRC [EP/I036079/1, EP/J017191/1] Funding Source: UKRI
- Office Of The Director
- Office of Integrative Activities [1002410] Funding Source: National Science Foundation
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Recently, lead iron tantalate/lead zirconium titanate (PZTFT) was demonstrated to possess large, but unreliable, magnetoelectric coupling at room temperature. Such large coupling would be desirable for device applications but reproducibility would also be critical. To better understand the coupling, the properties of all 3 ferroic order parameters, elastic, electric, and magnetic, believed to be present in the material across a range of temperatures, are investigated. In high temperature elastic data, an anomaly is observed at the orthorhombic mm2 to tetragonal 4mm transition, Tot = 475 K, and a softening trend is observed as the temperature is increased toward 1300 K, where the material is known to become cubic. Thermal degradation makes it impossible to measure elastic behavior up to this temperature, however. In the low temperature region, there are elastic anomalies near approximate to 40 K and in the range 160-245 K. The former is interpreted as being due to a magnetic ordering transition and the latter is interpreted as a hysteretic regime of mixed rhombohedral and orthorhombic structures. Electrical and magnetic data collected below room temperature show anomalies at remarkably similar temperature ranges to the elastic data. These observations are used to suggest that the three order parameters in PZTFT are strongly coupled.
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